To reinstall them, just open up your terminal and copy / paste these two commands:sudo pacman -S pamacsudo pacman -S pamac-tray-appindicator

NOTE: Just press “y” whenever a question comes up, and after that you should be good to go! (Just remember to go through the settings again, such as Enable AUR in "Add / Remove Software as it will revert all it’s settings back to the default ones).